Dynamic colloidal sorting on a magnetic bubble lattice

作者：Tierno Pietro^*; Soba Alejandro; Johansen Tom H; Sagues Francesc

来源：Applied Physics Letters, 2008, 93(21): 214102.

DOI：10.1063/1.3029740

• bubbles
• colloids
• garnets
• magnetic fluids
• magnetic moments
• magnetic particles
• magnetic thin films
• paramagnetism
• particle size

We use a uniaxial garnet film with a magnetic bubble lattice to sort paramagnetic colloidal particles with different diameters, i.e., 1.0 and 2.8 mu m. We apply an external magnetic field which precesses around an axis normal to the film with a frequency Omega=62.8 s(-1) and intensity 3120 A/m < H < 6911 A/m. By varying the component of the field H(z) normal to the film, we observe that particles of one size are localized around magnetic bubbles while the others are transported through the array. We complement the experimental measurements with numerical simulations to explore the sorting capability for particles with different magnetic moments.

• 出版日期2008-11-24